Which phrase identifies the standard difference in elevation on a topography map? index contour contour interval scale bar topographic symbol

contour interval

Explanation:

The correct answer is - contour interval.

The contour interval is the standard difference in elevation on the topographic maps. The contour lines themselves represent closed circular lines that connected dots that have the same elevation. The standard contour lines are set at an exact same interval, be it 5, 20, 100 meters. That elevation distance is actually representing the contour interval itself, which is the vertical distance between two contour lines.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."